Incredible UNESCO Sites in Danger of Disappearing

Belize Barrier Reef Reserve System

Why it’s special: This is the largest barrier reef in the northern hemisphere. Visit for the coral-made islands, more than 500 species of fish, and the "Great Blue Hole," a famed diving spot that's nearly 1,000 feet deep.

Why it’s in danger: In addition to development in the area, extensive mangrove cutting has removed food sources and shelter for marine life.